FlexRadio Signature FLEX-6000 Series User Manual

FLEX-6000 Signature Series – Maestro User Guide
Copyright 2024 FlexRadio, Inc. All Rights Reserved. | Page 70
15.4 AUTOMATIC NOTCH FILTER (ANF)
The Automatic Notch Filter automatically applies a Tracking Notch Filter, as described above, to
remove constant tones such as carriers and heterodynes from the received audio passband. These
filters can be applied to each Slice Receiver as needed.
The slider to the right of the ANF button controls the depth and sensitivity of the filter. Automatic
Notch Filters are not affected by the setting of the global Tracking Notch Filter control, section 15.3,
Turning all Tracking Notch Filters On or Off.
The Automatic Notch Filter algorithm uses a correlation-based adaptive filter. The filter decreases
the correlation of the input and output since a constant tone is highly correlated and should be
canceled out. The threshold adjustment controls the adaptation rate of the filter. If a loud tone is
present and you move the receive filter around it, you should hear the tone get canceled at
different rates depending on the threshold control setting.

FlexRadio Signature FLEX-6000 Series Specifications

General

Brand	FlexRadio
Model	Signature FLEX-6000 Series
Category	Transceiver
Language	English